3658385

Information

• Patent Grant
• 3658385

• References
• Source

• Patent Number

  3,658,385

• Date Filed

  Not available

• Date Issued

  Tuesday, April 25, 1972
  53 years ago

• CPC

  • E21C25/24 - with flat jibs only

• US Classifications

  • 299 - Mining or in situ disintegration of hard material